Ash and friends learn the legend of the Aura Guardian, a hero who saved the world with his Pokemon, Lucario. Can it be true? They find out when Lucario awakens and Pikachu disappears! The search for Pikachu takes Ash and Lucario to a mystical tree and the Mythical Pokemon Mew. The future of the world—and Pikachu’s fate—depends on the power of friendship between humans and Pokemon!